优化Model

app/models/challenge.rb

@@ -1,7 +1,6 @@
 class Challenge < ApplicationRecord
   # difficulty: 关卡难度: 1.简单 2.中等 3.困难
   # show_type: 效果展示：-1.无效果 1.图片 2.apk/exe 3.txt 4.html 5.mp3 6.mp4
-  default_scope { order("challenges.position asc") }
 
   belongs_to :shixun, :touch => true, counter_cache: true
   belongs_to :user

app/models/shixun.rb

@@ -5,7 +5,7 @@ class Shixun < ApplicationRecord
   # hide_code： 隐藏代码窗口
   # code_hidden: 隐藏代码目录
   # task_pass: 跳关
-  has_many :challenges, dependent: :destroy
+  has_many :challenges, -> {order("challenges.position asc")}, dependent: :destroy
   has_many :challenge_tags, through: :challenges
 	has_many :myshixuns, :dependent => :destroy
   has_many :shixun_members, dependent: :destroy